Arguments: the Good, the Bad, and the Ugly - Open resources

(A2) Premise: All cats purr. Conclusion: All non-purring things are non-cats. An argument can also be sound: if it is valid and has true premises. A sound argument is a formally valid argument with true premises. Both A1 and A2 are sound, but they are still daft arguments, because the premises give us no good reason to accept the conclusion. ................
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